Calling all car people...Piston stroke question.

[DragonTSD]

Hello!

This is my first time posting so please forgive any procedural missteps. A fellow MechE and I are looking into creating a test fixture for testing linear seals. He had the idea of using a stripped down straight 6 or 4 cylinder engine as the base for our test bed (basically a short block with the crank shaft attached to an electric motor). To carry the idea forward I'm looking for a commonly available engine with a sufficiently long stroke. Does anyone know of a production engine with a stroke longer than 3.98"? That's the stroke of a 300 cu in L6 engine (my frist car was an '85 F150).

our application involves a lengthy stroke, so we want to maximize the stroke of our test fixture.

Any thoughts?

Thanks

AJ

 

[MintJulep]

First Google hit for "bore and stroke of common engines"

http://www.donsautopages.co.nz/autoinfo/enginespecs.htm

 

[VEBill]

The old Chrysler 225 cu. in. "Slant-6" had a 4.125-inch stroke.

Do I win a prize?

 

[MintJulep]

But even better yet might be some old slow-running stationary or marine diesel.

 

[redpicker]

Chrysler's venerable 225 cubic inch slant six (The Leaning Tower of Power) had a 3.400" bore and a 4.120" stroke. That's a bit better.

BMW also used the canted cylinder bank design (used to allow a longer stroke in a lower profile) in their sixes, but I don't know what stroke they used.

rp

 

[patprimmer]

A machinist who specializes in grinding crankshafts would have a much better idea than us. Diesels are more likely but maybe more expensive. Very old is probably also more likely but maybe not so robust. I think the Slant 6 Valiant or Dodge as already mentioned is a good chance.

Google first is also a very good idea if you want respect and the help that results from the respect earned.

An aftermarket like Eagle makes lots of stroker kits for commonly hotrodded engines.

This really should have been in the "Engine & fuel engineering" section, but don't double post now. If you want it moved your best bet if you wish to stay sweet with the admin is to copy and paste this thread so far into a new thread in the appropriate area then red flag this thread yourself with a brief explanation why. It looks a LOT better for you if you red flag your own work if it needs removing rather than leaving it for someone else to do.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

http://eng-tips.com/market.cfm

for site rules

 

[GregLocock]

I'd have thought this idea saves a tiny amount of effort for rather large compromise. What stroke do you actually want? What rpm?

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[MiketheEngineer]

If I remember - the old Model A had a large bore and stroke.... Maybe not

 

[DragonTSD]

I did Google, apparently not very well, but still. Thank you for your help, MintJulep, that table helps a lot.

Sorry about posting this in the wrong place.

Have a nice day.

AJ